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Sun, 15 Feb 2026 08:56:23 -0600 Received: from [10.249.132.38] ([10.249.132.38]) by lelvem-mr05.itg.ti.com (8.18.1/8.18.1) with ESMTP id 61FEuJZ4329172; Sun, 15 Feb 2026 08:56:20 -0600 Message-ID: <8bf32649-ce75-4b62-a735-919d7b826e56@ti.com> Date: Sun, 15 Feb 2026 20:26:18 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net] net: phy: dp83869: Set auto mdix bit for forced 100Base-Tx mode To: Andrew Lunn CC: , , , , , , , , , Vignesh Raghavendra , Roger Quadros , References: <20260211131033.2525617-1-m-malladi@ti.com> <0a9d0ec8-09c4-4029-8449-8c8f08c6dca0@lunn.ch> <9a256949-56ee-4d10-949e-c5009852ca44@lunn.ch> Content-Language: en-US From: "Malladi, Meghana" In-Reply-To: <9a256949-56ee-4d10-949e-c5009852ca44@lunn.ch> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE33:EE_|MW4PR10MB6488:EE_ X-MS-Office365-Filtering-Correlation-Id: c965c0e6-88dc-4f4f-9e2a-08de6ca2634d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|36860700013|82310400026|1800799024; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: dFftAeLnny91PpPP50aknLFOtMOz4t/QXwjdBtbU2Jbx6ZawXYKFxuWCdutpaxQBqS1mW5bSRfhhiwu6sn//pHrlfUPESzR/4uyuh9dZ3D5iABzLvCVxG0JCyGDyIun9kPOFc2AGBRdDdtjK/28QIvG53yuIPFvJ0rkNaI5Gm+ObxAAL8weZyDiZX/vXfjAz3zRYbIFLpfg3oLOKVQ5IQ/gK/1IHUcuUFk++vavd8YPVVP4XzwGrjVZIdsI7H2iVOR94DtOT0dDW3kK2DThWNwxyd9YzCZukZ5BDj817+ciELht44zbsSUN0I71tLao3iGuXi3dsiRG5EMAORISihsYpwWsROfvutAtesHF/99wye2/TKOmGFFQ93Z5eF/8F+80jRMTw1BP22OE+XvPygjJGxBgV49R6SvkS8xBHeDZQFoQY8lkyum8AzRKDsRbV X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Feb 2026 14:56:23.8768 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c965c0e6-88dc-4f4f-9e2a-08de6ca2634d X-MS-Exchange-CrossTenant-Id: e5b49634-450b-4709-8abb-1e2b19b982b7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.23.195];Helo=[lewvzet201.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE33.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR10MB6488 Hi Andrew, On 2/12/2026 6:36 PM, Andrew Lunn wrote: >>> What about when you change the configuration out of forced 100 Full? >>> Shouldn't the configuration be returned to how the user wants >>> auto-MDIX configured? Should you disable robust Auto-MDIX so that >>> "unreliable Auto-MDIX" is used? >> >> This bit is only necessary if link partners are configured to operational >> modes that not supported by normal Auto MDI/MDIX mode (when one of that link >> partners are in Forced 100Base-TX), will fix it in v2. > > Does this bit have any effect on normal Auto MDI/MDIX mode? Can this > bit be set once during probe, rather than for a specific link mode? > > Is there an errata for this behaviour/fix? If there is please > reference the number/document etc. > I checked with the PHY team and they pointed me to this section of the DP83867 datasheet[1]: 7.6.25 Configuration Register 3 (CFG3) and said something similar is needed for DP83869 as well. There are a lot of similar corner cases which they haven't tested and once done, more details w.r.t to the possible errata will be published in the next datasheet revision (aimed in the next quarter). I guess it makes more sense to post this fix later with the published errata. [1]: https://www.ti.com/lit/ds/symlink/dp83867ir.pdf > Since this is a fix, please add a Fixes: tag. > > Andrew -- Thanks, Meghana Malladi